Function rewrite_link_target

perro_website/build.rs:304–354

(collection: &str, slug: &str, target: &str)

        .ok();
    for child in ["res", "src", "docs", "deps.toml", "routes.toml"] {
        let path = project_root.join(child);
        if let Some(time) = newest_mtime(&path)? {
            newest = Some(match newest {
                Some(current) if current >= time => current,
                _ => time,
            });
        }
    }
    Ok(newest)
}

fn newest_mtime(path: &Path) -> io::Result<Option<SystemTime>> {
    if !path.exists() {
        return Ok(None);
    }
    let metadata = fs::metadata(path)?;
    if metadata.is_file() {
        return Ok(metadata.modified().ok());
    }

    let mut newest = metadata.modified().ok();
    for entry in fs::read_dir(path)? {
        let path = entry?.path();
        let name = path
            .file_name()
            .and_then(|name| name.to_str())
            .unwrap_or("");
        if name == "target" || name == ".output" {
            continue;
        }
        if let Some(time) = newest_mtime(&path)? {
            newest = Some(match newest {
                Some(current) if current >= time => current,
                _ => time,
            });
        }
    }
    Ok(newest)
}

fn sync_dir(src: &Path, dst: &Path) -> io::Result<()> {
    if dst.exists() {
        fs::remove_dir_all(dst)?;
    }
    fs::create_dir_all(dst)?;
    copy_dir(src, dst)
}

fn copy_dir(src: &Path, dst: &Path) -> io::Result<()> {
    for entry in fs::read_dir(src)? {
        let src_path = entry?.path();
        let file_name = src_path
            .file_name()
            .ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "source has no file name"))?;